Beast Quest: Arcta the Mountain Giant by Adam Blade

Arcta the mountain giant was as tall as the highest trees, with a body almost as wide. His arms and legs bulged with muscle, and his feet left huge indentations in the ground. His gnarled hands ended in yellow claws and his mouth gaped open to reveal crooked, brown teeth. Unlike the Beasts Tom had already freed-the fire dragon and the sea serpent-there was no enchanted golden collar around his neck. Instead a black blindfold covered the Beast's eyes, held in place by a glowing knot. This was Malvel's curse. The Beast must be driven mad by the loss of his sight.